Meteoritical Bulletin: Entry for Allan Hills 85155

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Allan Hills 85155

Basic information

Name: Allan Hills 85155
This is an OFFICIAL meteorite name.
Abbreviation: ALH 85155
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 18.5 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 10(2)	(1987)	L3
Meteoritical Bulletin:	MB 76	(1994)	L3.7
NHM Catalogue:	5th Edition	(2000)	L3.7
MetBase:	v. 7.1	(2006)	L3.7
Recommended:			L3.7 [explanation]

This is 1 of 51 approved meteorites classified as L3.7. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Writeup

Writeup from AMN 10(2):

Sample No.: ALH85155

Location: Allan Hills

Weight (g): 18.5

Field No.: 2665

Dimensions (cm): 2.5 x 2 x 2.5

Meteorite Type: L3 Chondrite

Macroscopic Description: Roberta Score

Ninety percent of this angular stone is covered with fusion crust. Medium-gray matrix with abundant inclusions make up the interior. Oxidation is minimal.

Thin Section (,3) Description: Brian Mason

Chondrules and chondrule fragments are abundant, ranging up to 1.5 mm across, and are set in a finely granular matrix. Small amounts of pale brown glass are present in the matrix and in some chondrules. Nickel-iron is present in minor amounts. Microprobe analyses show olivine ranging in composition from Fa8 to Fa28, with a mean of Fa21 (CV FeO is 30); pyroxene composition ranges from Fs4 to Fs20. The meteorite is an L3 chondrite (probably L3.6); it may be another member of the ALHA77011 pairing group.

Data from:
  MB76
  Table 2
  Line 1383:

Origin or pseudonym:	Far Western
Mass (g):	18.5
Class:	L3.7
Weathering grade:	A/B
Fayalite (mol%):	8-28
Ferrosilite (mol%):	4-20
Comments:	NTL=104±17; 77011 pairing group

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):

References:

Published in Antarctic Meteorite Newsletter 10(2) (1987), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)

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Geography:

Antarctica

Coordinates:
Catalogue of Meteorites:	(76° 43'S, 159° 40'E)
Recommended::	(76° 50' 53"S, 156° 26' 13"E)

Note: the NHM and MetBase coordinates are 83.7 km apart

Statistics:
This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names)

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